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公开(公告)号：US1362508A
公开(公告)日：1920-12-14
申请号：US41313020
申请日：1920-09-27
Applicant: PULLOS PETER G
Inventor： PULLOS PETER G
IPC: E01B13/02
CPC classification number: E01B13/02 , E01B2201/02 , E01B2201/10
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